feat(scoring): transition workflow learning and fix history UX (#39)

- add transition scoring engine to learn sequential workflows per
directory using command skeletons
- prioritize current active git branch over older branches in
suggestions
- restore strict chronological order for history navigation and bypass
AI re-ranking
- add in-memory session history for instant access to just-run commands
- fix PTY prompt not syncing when using arrow keys in the history menu
- fix history tie-breaker to properly prioritize newer commands by
assigning larger IDs
- fix potential mutex deadlock between bufferMu and pty write during
history navigation
- fix workspace git detection to remove depth limits and correctly
identify repositories with detached HEADs
- fix SQLite connection leaks in frecency queries
- fix global state leaks in history tests by snapshotting and restoring
registry states
- modernize string prefix checks using strings.CutPrefix

internal/scoring/signals.go

@@ -8,16 +8,18 @@ import (
 )
 
 type SignalSet struct {
-	Workspace      workspace.WorkspaceInfo
-	LocalFrecency  []FrecencyEntry
-	GlobalFrecency []FrecencyEntry
-	Query          string
-	RootCommand    string
-	Cwd            string
+	Workspace         workspace.WorkspaceInfo
+	LocalFrecency     []FrecencyEntry
+	GlobalFrecency    []FrecencyEntry
+	TransitionEntries []TransitionEntry
+	TransitionIsLocal bool
+	Query             string
+	RootCommand       string
+	Cwd               string
 }
 
-// CollectSignals gathers environment, workspace, and historical frecency signals for the given query and directory
-func CollectSignals(ctx context.Context, cwd, query, rootCmd string, frecency *FrecencyStore) SignalSet {
+// CollectSignals gathers environment, workspace, and historical frecency/transition signals for the given query and directory
+func CollectSignals(ctx context.Context, cwd, query, rootCmd string, frecency *FrecencyStore, prevCmdSkeleton string) SignalSet {
 	ws := workspace.DetectCached(cwd)
 
 	if ctx == nil {
@@ -25,17 +27,25 @@ func CollectSignals(ctx context.Context, cwd, query, rootCmd string, frecency *F
 	}
 
 	var local, global []FrecencyEntry
+	var trans []TransitionEntry
+	var transIsLocal bool
+
 	if frecency != nil {
 		local, _ = frecency.QueryLocal(ctx, cwd, query, 50)
 		global, _ = frecency.QueryGlobal(ctx, query, 50)
+		if prevCmdSkeleton != "" {
+			trans, transIsLocal = frecency.QueryTransitionsWithFallback(ctx, prevCmdSkeleton, cwd)
+		}
 	}
 
 	return SignalSet{
-		Workspace:      ws,
-		LocalFrecency:  local,
-		GlobalFrecency: global,
-		Query:          strings.TrimSpace(query),
-		RootCommand:    strings.TrimSpace(rootCmd),
-		Cwd:            cwd,
+		Workspace:         ws,
+		LocalFrecency:     local,
+		GlobalFrecency:    global,
+		TransitionEntries: trans,
+		TransitionIsLocal: transIsLocal,
+		Query:             strings.TrimSpace(query),
+		RootCommand:       strings.TrimSpace(rootCmd),
+		Cwd:               cwd,
 	}
 }